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She has chin-length indigo hair. She dresses in a rock style with studded necklaces and bracelets, a light purple T-shirt with a skull on it, a black miniskirt, and black knee high boots. She lived with her mother, her father and her older sister.

When she is competing with villains, Yumi magically transforms her outfit into a battle uniform, which she wears a dark purple tanktop with a black horizontal stripe in the middle, white pantyhose and black Mary Jane shoes.

For night time, Yumi wears a black or a white sleeved nightgown with a skull in the middle.

For swimwear, Yumi first wears green bikini in the episode "Robo-Pop," but in "Surf's Up" and til the rest of the series Yumi now wears a purple string bikini with half a skull on the bikini top and the other half on the bikini bottom.

For formal wear in "Movie Madness", Yumi wears a black glittery glamorous dress with the same studded choker from her main outfit and wears black opera gloves.

As a magician assistant, she wore a pink hairband, a gold necklace, a pink tube top, a pink miniskirt and gold pumps.

In "Secret Origin" and the flashback of "Super Zero", she wore a black long sleeve shirt, a white flounced skirt, white socks and black Mary Janes shoes.

In the pilot, she had her hair being more purplish-toned and lighter, a dark magenta shirt with the skull having a green outline, slightly darker skin, freckles, a gray-cyan glove (on her right hand), spiked bracelet (on her left hand) and spiked collar, light bluish-purple socks and boots with shades of purple. She also had square-framed sunglasses on her hair in some shots.

Despite being younger than Ami, Yumi is also more impetuous than Ami and rushes headlong into a decision before thinking. However, Yumi has a mature side, too, and sometimes reasons with Ami's childish obsessions.